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首页> 外文期刊>Journal of Materials Engineering and Performance >Multipass Scratch Behavior of Borided and Nitrided H13 Steel
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Multipass Scratch Behavior of Borided and Nitrided H13 Steel

机译：硼化和氮化H13钢的多脂划痕行为

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摘要

AISI H13 steel was subjected to boriding and nitriding; its performance was evaluated by the progressive load scratch test, and then by the multipass scratch test (MPST), to evaluate the accumulated damage. Boriding and nitriding were carried out at a temperature of 800 and 580 degrees C, respectively, both treatments for 1 and 5 h of exposure time. In scratch test, a load range of 3-90 N was used for borides; a higher range (3-180 N) was chosen for nitrides. Critical loads (L-c) were estimated based on optical microscope observations of the scratch tracks. Failure mechanisms and residual depths were examined by scanning electronic microscope and optical profilometry. Finally, using fractions of L-c, MPST was applied on uncoated and coated samples, for 25, 50, 75 and 100 unidirectional scratch cycles. The coefficient of friction (COF) evolution was recorded and analyzed. A decrease in COF was observed as cycles go through; it was initially higher in uncoated sample; moreover, it was observed that normal load was determinant in its behavior, regardless of the treatment time. Nitrided samples exhibited less catastrophic failures over borided ones, also showed a better volume loss/load ratio performance, from 6 to 8 times better compared to borided samples.
机译：AISI H13钢拓展硼化和氮化;它的性能是通过渐进式负载划痕测试来评估，然后通过多峰划痕测试（MPST）来评估累计损坏。在800和580℃的温度下，硼化和氮化分别在接触时间1和5小时的温度下进行。在划痕试验中，用于硼化物的3-90n的负载范围;选择较高的范围（3-180n）用于氮化物。基于划痕轨道的光学显微镜观测估计临界载荷（L-C）。通过扫描电子显微镜和光学轮廓测定，检查失效机制和残余深度。最后，使用L-C的级分，在未涂覆的和涂覆的样品上施加MPST，25,50,75和100个单向划痕循环。记录和分析摩擦系数（COF）进化。观察COF的减少为周期;它最初在未涂层样品中更高;此外，无论治疗时间如何，都观察到正常载荷在其行为中是决定因素。与硼化的样品相比，氮化样品呈现出较少的灾难性失败，还显示出更好的体积损失/负荷比性能，从6至8倍比硼化样品更好。

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